Gorilla Stick Share definition Flag Slang used to describe the male sex organ, particularly when it is large and used to cause harm to others. After I got done banging my girl, I knocked her up-side the head with my Gorilla Stick. Gorilla Stick by SwerveDriver January 27, 2007 0 0 Get merch Get the Gorilla Stick mug. Buy Now — $32.95 See more merch